Velocity indicator



July 13, 1948.

J. MULLER 2,445,234

VELOCITY INDICATOR Filed May 31, 1939 I/vvnv roe dncauss MULLEE,

Patented July 13, 1948 UNITED STATES PAT ENT OFFICE Application May 31, 1939, Serial No. 276,713 In France May 31,1938

Section 3, Public Law 690, August 8, 1946 Patent expires May 31, 1358 (C1. Zil-l -Sl) 2 Claims.

This invention relates to velocity indicators for indicatingthe velocity-of flow of a fluid and more particularly has reference to such a device for in dicating the velocity electrically.

An object of this invention is to provide an indicator apparatus for indicating the velocity of flow of a fluid which includes a convergingdiverging tube, the neck of which is partially closed by a disc, a carbon pile resistance, and means for transmitting movements of said disc to variations in pressure in the carbon pile to vary the resistance of said pile so that the displacements of said disc can be electrically measured.

Another object of this invention is to provide a device for measuring the velocity of flow of a fluid which comprises a converging-diverging tube having a disc positioned to partially close the neck of said tube, a carbon pile resistance positioned axially of said tube, a spring urging said disc to closed position against the flow of sectional view of a fluid flow velocity indicator constructed in accordance with the present invention.

As shown in the drawing, the velocity indicator according to the present invention comprises a converging-diverging tube member having a lower converging member I, an upper diverging member 2, the throat or neck of said convergingdiverging member I, 2 is partly closed by a disc 2'! which is carried by a rod 28 slidably mounted in a boss 3 supported by elements extending radially inwardly from the throat of said tube. The upper portion of the rod 23 is of reduced cross section and slidably extends through an externally threaded sleeve 34 which is threadedly mounted in an internally threaded boss 4 supported in the upper portion of the diverging tube 2.

The lower end of the rod 28 carries an abutmen-t 29 which engages against the pusher rod 30 of the carbon pile 3. noted that the carbon pile, which consists of a plurality of juxtaposed discs, is carried in a tube. one end of which is supported in a sleeve 3i carried by inwardly extending arms 32 which in turn are supported by the converging tube I.

At this point, it Will be A compression coil spring surrounds the upper portion of rod 28 of reducedcross sectionwith its rower-end engaging the disc El and its upper end engaging the lower end of the externally threaded sleeve 34.

Since the sleeve 3 is mounted in the boss 4 for axial adjustment therein, it serves to vary the force exerted by the spring 33 on the disc 2'! on the carbon pile. A look nut 5 surrounds the upper portion of the sleeve 34 and serves to lock said sleeve in adjusted positions.

In operation. the disc 21 is adapted to be displaced by the flow of fluid through the tube l, 2 against the force of the spring. This, in turn, will displace the movable element of the carbon pile so that the pressure exerted by the spring on the carbon pile will vary in relation to the velocity of flow through the tube l, 2.

The variations in the displacement of the disc ti and the movable element of the carbon pile be indicated by placing the carbon pile in an electrical circuit so that the variation in resistthereof can be indicated. For this purpose, the terminals of the carbon pile are connected to terminals 65 which are carried by an insulating covering member 35 mounted on the lower tube I.

Having described my invention, what I claim 1s:

1. A velocity indicator comprising a converging-diverging flow tube supporting arms extending across the interior of the tube, a rod axially slidably mounted in bosses carried. by said arms, a disc lying in a plane perpendicular to and carried by said rod and movable axially of the tube toward and away from the portion of the tube of smallest diameter, a spring urging the disc toward the portion of the tube of smallest diameter, said disc being adapted to be displaced by the flow of fluid through the tube against the force of the spring, and a carbon pile having a movable element positioned in contact with one end of the rod so that the spring will compress the carbon pile and the pressure exerted by the spring on the pile will vary in relation to the velocity of fluid flow through the tube.

2. A velocity indicator comprising a converglag-diverging flow tube supporting arms extending across the interior of the tube, a rod axially slidably mounted in bosses carried by said arms, a disc lying in a plane perpendicular to and carried by said rod and movable axially of the tube toward and away from. the portion of the tube of smallest diameter, a spring urging the disc toward the portion of the tube of smallest diameter, said disc being adapted to be displaced REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 747,157 Fahrney Dec. 15, 1903 808,562 Milton Dec. 26, 1905 865,304 Harrison Sept. 3, 1907 1,214,745 Beard et a1 Feb. 6, 1917 1,335,238 Hopkins Mar. 30, 1920 1,426,735 Hendry Aug. 22, 1922 1,528,627 Peters Mar. 3, 1925 1,567,940 Gramberg Dec. 29, 1925 Number Number 4 Name Date Pumprey Apr. 20, 1926 Keller Apr. 20, 1926 Fales July 5, 1927 Collins Sept. 8, 1931 Burleigh May 24, 1932 Martin May 31, 1932 Subkow May 9, 1933 Lewis Aug. 8, 1933 Rippe Oct. 29, 1935 Keller Feb. 11, 1936 Hoesel Nov. 10, 1936 Williams Oct. 19, 1937 FOREIGN PATENTS Country Date Germany May 21, 1899 Great Britain July 31, 1919 Switzerland June 16, 1930 Great Britain Jan. 11, 1923 Germany Nov. 1, 1922 Germany Mar. 22, 1926 Great Britain Aug. 18, 1936 France Apr. 9, 1929 France Mar. 16, 1931 France Mar. 7, 1938 

